摘要:
Embodiments of the invention are directed to an IR photodetector that broadly absorbs electromagnetic radiation including at least a portion of the near infrared (NIR) spectrum. The IR photodetector comprises polydispersed QDs of PbS and/or PbSe. The IR photodetector can be included as a layer in an up-conversion device when coupled to a light emitting diode (LED) according to an embodiment of the invention.
摘要:
Embodiments of the invention pertain to a method and apparatus for sensing infrared (IR) radiation. In a specific embodiment, a night vision device can be fabricated by depositing a few layers of organic thin films. Embodiments of the subject device can operate at voltages in the range of 10-15 Volts and have lower manufacturing costs compared to conventional night vision devices. Embodiments of the device can incorporate an organic phototransistor in series with an organic light emitting device. In a specific embodiment, all electrodes are transparent to infrared light. An IR sensing layer can be incorporated with an OLED to provide IR-to-visible color up-conversion. Improved dark current characteristics can be achieved by incorporating a poor hole transport layer material as part of the IR sensing layer.
摘要:
The subject invention pertains to a piezoelectric device structure for improved acoustic wave sensing and/or generation, and process for making same. The piezoelectric thin film field effect transducer can be a thin film transistor (TFT) with either a piezoelectric film gate or a composite gate having a dielectric film and a piezoelectric film. The TFT structure can be either a top gate device or a bottom gate device. In an embodiment, the piezoelectric device structure can be used to form an array of piezoelectric thin film field effect transducers. A TFT switch can drive each piezoelectric transducer in the array. The piezoelectric transducers can both generate and sense acoustic waves. In a sensing mode, a signal from an acoustic wave can be collected at a readout terminal of the piezoelectric transducer. In a generating mode, an excitation signal can be applied across the piezoelectric transducer while the switch is ‘on’.
摘要:
Techniques are described for forming an organic light emitting diode device with improved device efficiency. Materials having at least one energy level that is similar to those of a phosphorescent light emitting material in the diode are incorporated into the device to directly inject holes or electrons to the light emitting material.
摘要:
An embodiment of the present invention pertains to an electronic device such as a passive matrix display, an alpha-numeric display, a detector array, or a solar cell array. The electronic device includes multiple organic optoelectronic devices and one or more of these organic optoelectronic devices are protected from shorts. Each of the one or more organic optoelectronic devices that is protected from a short has one of its electrodes coupled to a first current limiting device and optionally has another electrode coupled to a second current limiting device. Also, one of the electrodes of that organic optoelectronic device, the first current limiting device, or the second current limiting device is patterned.
摘要:
A driver circuit for an active matrix display is disclosed wherein said driver circuit comprises a first transistor, said first transistor comprising a source, a drain and a gate; a storage capacitor, said storage capacitor comprising a terminal, said terminal connected to one line, said one line comprised of a group of said source and said drain of said first transistor; a second transistor, said second transistor comprising a source, a drain and gate, wherein said gate is connected to said terminal of said storage transistor; wherein said drain and said source of said second transistor are connected to one of group, said group comprising a power source and a pixel element respectively; and further wherein storage capacitor is chargeable to sufficiently high voltage to operate said second transistor in its linear region of operation.
摘要:
An organic electroluminescent display device including a layer of organic electroluminescent material disposed between electrodes for emitting an optical effect. The electroluminescent layers providing discrete electroluminescent pixels which are electrically isolated from one another by a first dielectric material wall structure and a second dielectric material wall structure. The wall structures provide for reliable manufacturing of the display device and prevent electrical shorting between a first electrically conductive material and a second electrically conductive material.
摘要:
Image scanner and display apparatus including an array of organic electroluminescent devices, each device operating as a light emitter when forward biased and as a light detector when reverse biased. Electronics coupled to the array and having a display mode and a scanner mode, the electronics sequentially forward biasing the array of organic electroluminescent devices, one row at a time, to emit light in the display mode, and sequentially forward biasing alternate columns of devices to emit light, one column at a time, and reverse biasing an associated column of devices for detecting light in the scanning mode, whereby light emitted from a forward biased column and reflected by information being scanned is received by the reverse biased associated column.
摘要:
An organic electroluminescent device with graded region is formed, which includes a hole transporting region formed of hole transporting organic material, an electron transporting region formed of electron transporting organic material, and a graduated region disseminated between the hole transporting region and the electron transporting region. The graduated region changes, either in steps or continuously, from hole transporting organic material adjacent the hole transporting region to electron transporting organic material adjacent the electron transporting region. Electrical contacts are formed in communication with the hole transporting region and the electron transporting region.
摘要:
An organic electroluminescent display device (10) includes a plurality of organic layers (16, 18, and 20) disposed between opposing electrode assemblies (12 and 14). One electrode assembly (12), the anode assembly, is fabricated of a substrate (22) and electrode (24), and a layer of a compensating material (26) disposed between electrode (24) and the overlying layers of light emitting materials (16, 18, 20). Layer (26) compensates for physical mismatches between the inorganic electrode layer (24) and the organic light emitting layers (16, 18, 20).